CVE-2025-46570— vLLM’s Chunk-Based Prefix Caching Vulnerable to Potential Timing Side-Channel
Quick assessment
Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
vLLM是vLLM开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.9.0之前版本存在安全漏洞，该漏洞源于PageAttention机制中的时间差异可能被利用。
Possible ATT&CK Techniques 1 AI
T1115 · Clipboard Data
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I. Basic Information for CVE-2025-46570
Vulnerability Information
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Vulnerability Title
vLLM’s Chunk-Based Prefix Caching Vulnerable to Potential Timing Side-Channel
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models (LLMs). Prior to version 0.9.0, when a new prompt is processed, if the PageAttention mechanism finds a matching prefix chunk, the prefill process speeds up, which is reflected in the TTFT (Time to First Token). These timing differences caused by matching chunks are significant enough to be recognized and exploited. This issue has been patched in version 0.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vLLM是vLLM开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.9.0之前版本存在安全漏洞，该漏洞源于PageAttention机制中的时间差异可能被利用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| vllm-project | vllm | < 0.9.0 | - |
|
II. Public POCs for CVE-2025-46570
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-46570 (1)
IV. Related Vulnerabilities
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Same weakness: CWE-208
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V. Comments for CVE-2025-46570
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